If we make it any more easy, trolls will abuse it, to abuse others. I've already seen enough suggestions that I need more vitamin rape in my life to know that anyone with actual constructive criticism likely doesn't need so many additional layers of secrecy, and won't mind a few witnesses to their well constructed professional opinion.

Problem is that even if people offer a constructive/professional opinion in disagreement with a popular comment, it will get downvoted into oblivion by the masses. This isn't a huge issue because the poster of the original comment will still see the argument via orangereds, but it encourages people not to argue with popular opinions and to just downvote and move on rather than comment.